Downgrade default SonarQube version to 4.4

While the package is not technically available from the apt repository,
I am pinning the version to 4.4 as there appears to be some refactoring
required to support 4.5.
Bump version for next release.
Fix SSL key permissions to allow read by postgres

The permissions were too restrictive and were preventing the postgresql
service from being able to read the key at startup.